Girls, Dating question?

Ok ladies...I went out on a date with a lady, her personality was amazing. I really enjoyed myself... physically she is attractive, but for me, she has something slightly missing.It isn't like I see her and want to rip her clothes off straight away... In honesty I am on the fence about her..Is it fair on her to see her a second/third time hoping I might see that spark sexually? Or should I just walk away until I am not confused about the situation anymore?Any advice appreciated